Drawing or punching press



Jan. 30, 1923. 1,443,476. w. KLOCKE.

DRAWING OR PUNCHING PRESS.

HLED AUGI2,l918. 3 SHEETS%HET L Fgi ill g A Z V E :1 u j 4 5.2% g m g INVENTOR By A iiomcys,

Jan. 30, 1923. 1,443,476. W. KLO C KE.

DRAWING 0R PUNCHING PRESS.

HLED AUG. 12. 1918- 3 SHEETSSHEET Z.

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I INVENTOR fi By A iiomeys,

6pm, QWJK w Jan. 30, 1923. 1,443,476.

W. KLOCKE.

DRAWING 0R PUNCHING PRESS.

HLED AUG.12, 1918. 3SHEETSSHEET 3.

MIHIIIMUHHUUUH IIIIIIIIIHHWIUIUM INVENTOR, WITNESS; 5 5 W By Attorneys,

Patented Jan. 30, 1923.

UNETED STATES Parana WILLIAM KLOCKE, O13 WOODHAVEN, NEW YORK, ASSIGNOR TO E. W. BLISS COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF WESTVIRGINIA.

DRAWING- OR PUNCHING PRESS.

Application filed August 12, 1918. Serial No. 249,492.

To all whom it may concern:

Be it known that I. \YILLIAM TTLOCKE,

a citizen of the United States of America. residing in Voodhaven, in the borough of Queens, county of Queens. city and State of New York, have invented certain new and useful Improvements in Drawing or Punching Presses. of which the following is a specification.

This invention is intended as an improvement in presses. more particularly of the drawing or punching type, and the purpose is to obtain a relatively short stroke of high power from a driving mechanism reopiiring a minimum power supply.

This purpose isattained by a combination of hydraulic and mechanical means. The press is formed with two connected hydraulic cylinders of widely different diameters; in the larger cylinder moves a piston or plunger carrying the usual punch or upper die; in the smaller cylinder moves a plunger or ram of relatively long stroke. which is reciprocated by mechanical means, preferably by cranks or a power-driven shaft, communicating movement through connecting rods to a cross-head carrying such plunger. Thus each down stroke of the plunger communicates motion through the intervening liquid to the punch piston, which is forced down at a speed which is reduced in inverse proportion to the areas of the respective cylinders, and with a corresponding increase of power.

After the punch supporting piston has completed its active or down stroke, it be comes necessary to supply some means for returning it or lifting it to normal position, preparatory to another operation, and an additionalpurpose of this invention is to accomplish this by a positive mechanical action. Specifically, this is accomplished by the driving means for the power plunger. acting through intermediate connecting devices. which are timed so as to return the die supporting piston coincidently with thereturn of the power plunger.

To these and other ends. the invention consists in certain improvements and combiwith a preferred embodiment of the invention.

Fig. 2 is a side elevation, partially in section. of the arrangement shown in Fig. 1.

Fig. 3 is a horizontal sectional view on line 3-3 of Fig. 1, and

Fig. l is a detail view of a slightly modified arrangement of the parts used in returning the die supporting piston.

In the illustrated embodiment, which is intended only by way of example of a practical working out of the invention, and not as limiting it to any particular form, A designates the base of a stationary frame, including uprights B, and a top frame C. The standards B support a head portion D, within which are formed the hydraulic cylinders, namely a cylinder E of large section. and a cylinder F of reduced section. The smaller cylinder F receives a reciprocatory plunger G. constituting the power plunger, and mounted upon a reciprocating cross-head H, which is movable in suitable guides in frame C. in the usual manner.

The cross-head H is actuated by driving means in the following way: Journalled. in the base A are gear wheels I, which also constitute disc cranks. and to this end are provided with crank pins a, which receive the lower ends of connecting rods b. the upper ends of the latter being joined to the crosshead H. The gear wheels I are engaged by pinions c fixed on a shaft carrying the gears f. and the latter are in turn driven by pintains a. rec-i )rocatorv )unch or die su orting piston J. and between the piston J and the plunger G is arranged a body of liquid. which acts to transfer the power to the piston J. whereby the latter is moved clownwardly during the downward travel of the plunger G, but at a slower rate of speed, and with consequent greater force. In order to effect return of the piston J to its normal position during the return stroke of the plunger G, I provide a supporting frame K, which engages a'shoulder 70 on the piston J. The supporting frame K is slidable vertically in guide ways 6, and carries, fixed thereon, pins or projections m. The latter form a part of connecting means between the supporting frame K and the cross-head driving devices,.previously described, so that the continuous movement of the latter serves to cause a positive return travel of the piston J through a mechanical connection. This is accomplished by providing the gears- 1 upon their inner faces, with cam faces or grooves 01, which are eccentrically arranged, and receive the outer ends of the projections 772; thus, during the continuous rotation of the gears I, while driving the cross-head, an up and down movement is imparted to the supporting frame K and piston J, through the corresponding movement of the projections m, due to the eccentricity of the cam grooves, which control their movement. The relation between the projection m and the cam n in the disc member or gear I is timed so as to return the die supporting piston J to its normal position coincidently With the return of the plunger G, and, while it is preferred to effect this act-ion from the driven gears I, it may be accomplished in other ways, still adhering to the scheme of a mechanical drivingconnec-tion between the cross-head driving devices and the punch supporting piston.

This same result may be obtained by hydrostatic means, instead of a mechanical connection, and a possible arrangement for this purposeis illustrated in Fig. 41. The piston supporting frame is designated by M, and carries a plurality of plungers 0, movable in the fluid chambers p. The latter are intended to be connected with suitable pressure retaining (means, such as a hydraulic accumulator, which will act automatically to elevate the plungers 0 and the piston supporting frame during the upward travel of the plunger G While I show and describe a particular form of the invention, it will be understood that the improvements are not restricted in their application to the present disclosure,

and the purposes of the invention may be attained by other possible methods and by modifications of the details herein set forth, without' departing from the underlying spirit of the invention, or the scope. of the following claims lVhat I claim is 1. A hydro-mechanical press comprising a base, an upright frame mounted thereon, formed with connecting hydraulic cylinders of different areas, a unch piston in the larger cylinder projecting beneath the same to carry a punch ordie, a plunger entering the smaller cylinder from above, a cross-head I guided in said frame and carrying said plunger, two gear. wheels forming disc cranks located'on opposite sides of said base, a shaft having pinions for driving said gears in unison, connecting rods engaging the crank pins on said gear wheels, extending up outside the upright frame on opposite sides thereof, and jointed to the ends of said cross-head, and returning means for lifting the piston on the upstroke of the plunger independently of the hydraulic action of said plunger, comprising a movable frame engaging the piston, guides restraining said frame to a parallel upright movement, and a camconnected to the driving means and engaging said frame to force up the piston.

A press according to claim 1, such returning means comprising a movable frame engaging the piston, moving in guides, and an eccentric connected to the driving shaft and engaging said frame to force up the piston.

3. A press comprising a cross-head and a plunger connected to it, a pair of disc cranks connected to the cross-head, driving means for the cranks, the disc cranks having cam faces upon one side, cylinders of different cross-sectional areas in communication with each other, and adapted to contain a liquid, said plunger travelling in the smaller cylinder, a punch piston movable in the larger cylinder, a movable frame for the punch piston, and projections mounted on the frame and engaging said cam faces to im part a positive return movement to the piston. I

41. A press comprising a cross-head and a plunger connected to it, driving means for the cross-head, cylinders of different crosssectional .areas in communication with each other and adapted to contain a liquid, said plunger travelling in the smaller cylinder,

a punch piston movable in the larger cylin der, a movable supporting frame for the piston, projections mounted on the frame, and

a rotary member having an eccentricallydisposed cam groove engaging said projections and acting to impart a positive return movement of the punch piston to normal position.

5. A press comprising a' cross-head and a plunger connected to it, driving means for the cross-head, a constantly rotating disc member operated by said driving means and having an eccentrically arranged cam face on one side, cylinders of different cross-sectional areas in communication with each other and adapted to containa liquid, said plunger travelling in the smaller cylinder, a punch piston movable in the larger cylinder, and a movable frame connected to the piston and engaging said cam face whereby to effect a positive return of. the piston to normal position. I

6. A hydro-mechanical press comprising a base, an upright frame mounted thereon, formed with connecting hydraulic cylinders of different areas, apuncln piston in the larger cylinder projecting beneath the same the smaller cylinder from above, and acrossto the ends of said cross-head, said gear head guided in said frame and carrying said wheels having eccentric cam grooves, and 10 flunger, combined with driving means coinprojections on opposite sides engaging said prising two gear wheels forming disc cranks cam grooves and movable to communicate located on opposite sides of said base, a lifting movement to said piston.

shaft having pinions for driving said gears In Witness whereof, I have hereunto in unison, connecting rods engaging the signed my name.

crank pins on said gear wheels, and jointed i WILLIAM KLOCKE! 

